Technical Guidance for Purchasing a Material Tensile Testing Machine
Dongguan Lixian Instrument Technology Co., Ltd.
Material tensile testing machine is also called electronic tensile testing machine. It has an independent servo loading system and a high-precision broadband electro-hydraulic servo valve to ensure high precision, high efficiency, low noise, and fast response of the system; an independent hydraulic clamping system ensures that the system runs smoothly with low noise, and the sample is firmly clamped during the test. Hold without slipping. The material tensile testing machine can do the functions of tension, compression, bending, peeling/tearing and so on. When purchasing a material tensile testing machine, you need to understand some technical problems. The following editor will explain the mystery to you.
1. Selection of models: First, determine the maximum force value to be tested. The maximum force value is below 5KN. Generally, a single-column electronic tensile testing machine is used. Larger than 5KN to 50KN, a double-column desktop electronic universal material testing machine is generally used. Above 50KN, the floor-type electronic universal material testing machine is selected.
2. Airframe speed and height selection: understand the test space required for the test. The beam displacement and vertical test space required by the test, the beam displacement of 898mm and the vertical test space of 1067mm are generally sufficient. If it is an elastic body test, the beam displacement and vertical test space will be higher. Therefore, there should be ultra-wide racks or ultra-high racks to meet the needs of different customers.
3. Selection of load sensors: Whether the load measurement accuracy meets or exceeds the standards of ASTM4 and ISO7500/1. The load cell should also consider: range, accuracy, repeatability, offset loading error, nonlinearity, stability compensation range, temperature zero drift and sensitivity. The automatic identification, calibration and zeroing of load cells greatly speeds up the testing process and ensures data consistency and accuracy. Also, consider the availability of self-identification before starting a trial to prevent human error. The full-scale regulator eliminates manual range adjustments by the operator.
4. Selection of strain measurement: any mechanical system will deform after being stressed, no matter how slight. The same applies to material testing systems. The frame, load cells, and grips of your system are not infinitely rigid and will deform slightly when a force is applied to the specimen. This deformation is called compliance and can lead to severe errors in test results, especially in high load tests with small stroke requirements. Therefore, all racks must be designed to include very strong beam guides, providing the highest level of beam stiffness, high stiffness load cells and fixtures, to ensure the maximum accuracy of test results. When extremely accurate measurement of specimen deformation is required, system compliance errors can be completely avoided by using an extensometer.